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Citation: LI Xiao-Feng, WANG Ping, LIANG Guang-Hua, DI Chun-Yu, LI Zhi-Hong, WANG Long, DOU Tao. Influence of the Manner of Adding Aluminum Source on the SAPO-34 Molecular Sieves Synthesis and the MTO Catalytic Properties[J]. Chinese Journal of Inorganic Chemistry, ;2016, 32(3): 450-456. doi: 10.11862/CJIC.2016.070 shu

Influence of the Manner of Adding Aluminum Source on the SAPO-34 Molecular Sieves Synthesis and the MTO Catalytic Properties

1.
Institute of Special Chemicals, Taiyuan University of Technology, Taiyuan 030024, China
2.
CNPC Key Laboratory of Catalysis, China University of Petroleum, Beijing 102249, China

Corresponding author: LI Xiao-Feng, lixiaofeng6008@163.com
Received Date: 31 October 2015
Revised Date: 11 January 2016

Figures(6)

In hydrothermal synthesis system, with triethylamine (TEA) and tetraethyl ammonium hydroxide (TEAOH) as the mixed template agent, the influence of the manner of adding aluminum in the preparation of the initial gel on the SAPO-34 molecular sieves synthesis and the catalytic performances of methanol to olefins (MTO) reaction was investigated. The products were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), Nitrogen isothermal adsorption stripping (BET), ²⁹Si MAS NMR and NH_3-TPD. The catalytic performances of methanol to olefins (MTO) were also investigated. The results showed that the particle size of SAPO-34 molecular sieve became smaller and the cubic morphology gradually turned into sheet-like, with the increased of the first addition amount of aluminum, and the proportion of Si (4Al) species in the as-synthesized SAPO-34 increased, the amount of strong acidity and the acid density also increased. The results also showed that the lifetime of SAPO-34 molecular sieve in MTO reaction is gradually extended, the ethylene selectivity decreases and the propylene selectivity increases with the increasing of the first addition amount of aluminum source.
- SAPO-34 molecular sieve,
- gelling,
- the manner of adding aluminum source,
- acidic property,
- MTO
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